A sustainable management of soil organic matter is fundamental for the maintenance of the soil productivity. The objective of this study was to evaluate changes in the contents and storage of the fractions of the soil organic matter under different management systems compared to the native vegetation as reference in a Red-yellow Latosol in the southern region of the State of Espírito Santo, Brazil. The applied treatments consisted of four land use systems: native forest, annual crop, perennial crop and pasture. Samples were taken from 0 to 10 cm layer for the physical fractionation of soil organic matter, analyzing the amount of total organic carbon and carbon in the light and heavy fraction determining the storage of carbon in the light and heavy fraction. In the native forest, the amounts and storage of carbon were the highest, both in the light and heavy fraction showing stability in the soil carbon reserve. The light fractions of the soil organic matter are more sensitive to the management of the land use systems than the heavy fraction and total organic carbon.
Key words: Soil tillage, agroecosystems, organic carbon.
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